VSL provides post-tensioning and related construction services for bridges, buildings, and other structures. They have developed techniques for post-tensioning, segmental and incremental bridge construction, cable-stayed bridges, and foundations. VSL offers a wide range of construction systems, equipment, engineering services, and materials to optimize design and execution of post-tensioning projects.

1. Autofonçage®
Ductal®
Climbform
Post-tensioned
tank
Heavy lifting
Grouting
VSoL®
INCREMENTAL LAUNCHING
STAY CABLE BRIDGE
Ground
anchors
Jacks
Ground
anchorsTemporary
structures
for erection
Superstructure-
substructure
interface
optimisation
Precast
segments
CANTILEVER BRIDGES
Transverse
post-tensioning
External and internal
permanent post-tensioning
Temporary
post-tensioning
Jacks
Slab post-tensioning
Monitoring
Climbform
Tendon
Transfer plate
post-tensioning
Post-tensioned
masonry
Slab on ground
post-tensioning
Form travellers
Launching girders
Joints
Bearings Anchorages
Multi-barrier
protection of
stay cables
Dampers
Micropiles
Barrettes
Diaphragm
wall
VSL techniques and services
POST-TENSIONING (PT)
To artificially create compression
forces in order to reinforce a structure
during its construction and/or service
life: tendons with anchorages are
incorporated in the structure and
stressed with jacks. PT rather than
reinforced concrete allows better use
of materials and longer spans, though
it does require more complex calcula-
tions, more resistant materials and
careful execution of the work. Stay
cables are a technology derived from
concrete post-tensioning: stay cables
must support the bridge deck as well
as withstand fatigue load while the
structure is in use. VSL is a leader in
both technologies.
Anchorages. They transfer the pres-
tressing force to the concrete.
VSL's anchorages are based on the very
reliable self-locking wedge system.
The CS2000 anchorage has a compo-
site bearing plate (metal and high-
performance concrete) which makes it
lighter and more durable.
Grout. An optimized mix of cement,
water and admixtures that is injected
into the ducts to provide corrosion pro-
tection and bond between the prestres-
sing steel and concrete members.
Grouting is critical to a structure’s dura-
bility. VSL works continually to improve
it and has developed the high perfor-
mance VSL-HPI Grout™.
Ducts. They provide protection for the
strands. VSL developed the PT-
PLUS™ system of plastic ducts and
couplers with the possibility of having
electrically isolated tendons (EIT).
PT IN BUILDINGS
Transfer plate. PT very effectively
reduces the reinforcement for passive
bending and shear as well as the volu-
me of concrete. Can be constructed in
several layers.
Micropiles. for alternating tensile and
compressive loadings.
VSoL®
retained earth. Reinforcement of
backfill using welded wire mesh or
polymeric strips combined with light-
weight precast concrete facing panels.
Barrettes and diaphragm walls.
Large rectangular reinforced concrete
piles constructed using a grab bucket
or cutter. Barrettes can take many
forms and lengths. These barrettes
can be contiguous and form a water-
proof retaining wall called “diaphragm
wall”. Using a cutter, hard ground can
be excavated to depths of 100 m with
very little vertical deviation.
PACKAGES
A combination of services that includes
feasibility studies, construction enginee-
ring, equipment supply and operation.
Erection and launching equipment.
Gantries and frames for all lifting,
lowering and placing applications.
Climbform. VSL’s self-climbing, modular
system for construction of vertical walls.
It gives complete flexibility in structural
design of the walls and selection of
finishes.
Special formwork systems. Large
table forms for fast track construction.
Mivan, an easy to assemble modular
aluminium formwork for efficient
assembly by hand.
Bearings and Joints. Manufactured to
customized requirements. Services:
design, testing, supply and installation.
Heavy lifting. Effective tailor-made
solution, with VSL’s strand lifting system,
for projects where cranes cannot be used.
Autofonçage®
. Pulling a precast
concrete underpass through a railway
or road-embankment with a minimum
interruption of the traffic flow.
Ductal®
. A new ultra-high performance
concrete with a unique combination of
superior properties such as high strength,
durability and ductility. Marketed by VSL,
it gives engineers and architects a totally
new building material for creative
solutions.
VSL's construction systems/methods and related engineering, with post-tensioning as a core business, have earned a well-deserved reputation for their quality and reliability for almost half a century.
Slab post-tensioning. The advantages
are the smallest possible floor-to-
floor height, the largest possible
column-free space, and quickest pos-
sible floor cycle.
Slab-on-ground. Used for ware-
houses, container terminals, recrea-
tional slabs, etc. PT reduces the need
for joints, which cuts future mainte-
nance costs. Provides a thinner,
crack-free slab.
Post-tensioned masonry. PT allows
higher walls with greater stability and
the possibility of strengthening exis-
ting structures, e.g. in seismic areas.
PT IN BRIDGES
Segmental bridges. To brake down the
deck into segments to enable mechani-
zed construction. External PT suits this
method well, as it reduces construction
time and allows easy inspection of ten-
dons. VSL executes segment production
and erection for precast solutions, as
well as cast in place deck construction,
providing optimization of the permanent
work design and engineering and sup-
ply of the temporary equipment. Bar
and Slab PT systems allow vertical web
and transverse deck stressing.
Incrementally launched bridges. Well
suited for bridges over congested areas
and waterways. Centrical prestressing
during construction combines perma-
nent and temporary PT. VSL provides the
equipment for casting and launching.
Cable stayed bridges. In this particularly
aesthetic type of bridge, stressed
strands support the deck. VSL's SSI 2000
system provides full individual encapsu-
lation for each strand from wedge to
wedge, and strands are stressed indivi-
dually with a fully automated system. Full
prefabrication avoids site assembly on
the critical path. The very compact
anchorages permit easy installation in
confined spaces. Friction dampers are
placed at deck level to prevent stay vibra-
tions, on both new and existing bridges.
PT IN SPECIAL STRUCTURES
Tanks, water towers, silos, and shells.
PT applications include circumferential
and vertical post-tensioning of walls
as well as suspension of tank shells.
VSL’s development of the “Flower
Anchorage” allows reducing the
concrete dimensions.
MONITORING AND REPAIR
Monitoring. Periodic inspection,
detailed investigation, material testing,
permanent monitoring installation for
post-tensioned structures, stay
cables, and soil assessment.
Structural repairs. After damage analysis
and determination of procedures,
remedial works such as crack injection,
jacketing repairs, replacement works,
repairs to fire-damaged structures and
waterproofing, shotcreting and pressure
grouting, internal and external PT, glued
and/or bolted steel and FRP plates,
anti-carbonation treatment and concrete
surface repairs.
GEOTECHNICS
& FOUNDATIONS
Ground anchors. They stabilise the
ground or anchor a structure to the
ground. They can be both strand and
bar anchors. VSL has developed an
electrical resistance measurement
system to check anchor integrity.

2. Your post-
tensioning
partner
www.vsl-intl.com
HEADQUARTERS
VSL International Ltd.
Scheibenstrasse 70 – Bern
CH-3014 – Switzerland
Phone: +41 32 613 30 30
Fax: +41 32 613 30 55
MALAYSIA
VSL Engineers (M) Sdn. Bhd.
KUALA LUMPUR
Phone: +603 - 7981 47 42
Fax: +603 - 7981 84 22
PHILIPPINES
VSL Philippines Inc.
PASIG CITY
Phone: +632 672 17 03
Fax: +632 672 13 95
SINGAPORE
VSL Singapore Pte. Ltd.
SINGAPORE
Phone: +65 - 6559 12 22
Fax: +65 - 6257 77 51
TAIWAN
VSL Taiwan Ltd.
TAIPEI
Phone: +886 - 2 - 2759 6819
Fax: +886 - 2 - 2759 6821
THAILAND
VSL (Thailand) Co. Ltd.
BANGKOK
Phone: +66 - 2 - 237 32 88
+66 - 2 - 237 32 89
+66 - 2 - 237 32 90
Fax: +66 - 2 - 238 24 48
VIETNAM
VSL Vietnam Ltd.
HANOI
Phone: +84 - 4 - 8245 488
Fax: +84 - 4 - 8245 717
Ho Chi Minh City
Phone: +84 - 8 - 8258 144
Fax: +84 - 8 - 9102 596
www.vsl-intl.com
Australia
VSL Prestressing (Aust.)
Pty. Ltd.
SYDNEY
Phone: +61 2 9 484 59 44
Fax: +61 2 9 875 3894
BRISBANE
Phone: +61 7 3265 64 00
Fax: +61 7 3265 75 34
MELBOURNE and SOUTHERN
Phone: +61 3 979 503 66
Fax: +61 3 979 505 47
VSL LOCATIONS
Americas
ARGENTINA
VSL Sistemas Especiales de
Construcción Argentina SA
BUENOS AIRES
Phone: +54 - 11 - 4326 - 06 09
Fax: +54 - 11 - 4326 - 26 50
CHILE
VSL Sistemas Especiales de
Construcción S.A.
SANTIAGO
Phone: +56 - 2 - 233 10 81
Fax: +56 - 2 - 233 67 39
MEXICO
VSL Corporation Mexico SA de CV
MEXICO
Phone: +52 - 55 - 5 - 396 86 21
Fax: +52 - 55 - 5 - 396 84 88
UNITED STATES
VStructural LLC
BALTIMORE, MD
Phone: +1 - 410 - 850 - 7000
Fax: +1 - 410 - 850 - 4111
Middle East
UNITED ARAB EMIRATES
VSL Middle East Office
DUBAI
Phone: +971 - 4 - 282 08 03
Fax: +971 - 4 - 282 94 41
Africa
SOUTH AFRICA
VSL Systems
(South Africa) Pty. Ltd.
Tsala-VSL Construction Systems
(Pty) Ltd
Kya Sand, RANDBURG
Phone: +27 - 11 - 708 21 00
Fax: +27 - 11 - 708 21 20
Europe
AUSTRIA
Grund-Pfahl- und Sonderbau
GmbH Industriestrasse 27a
AT-2325 Himberg bei Wien
Phone: +43 - 2235 87 777
Fax: +43 - 2235 86 561
BELGIUM
N.V. Procedes VSL SA
BERCHEM
Phone: +32 3 230 36 34
Fax: +32 3 230 89 65
CZECH REPUBLIC
VSL Systemy (CZ), s. r. o.
PRAGUE
Phone: +420 - 2 - 67 07 24 20
Fax: +420 - 2 - 67 07 24 06
FRANCE
VSL FRANCE S.A.
ST-QUENTIN-EN-YVELINES
Phone: +33 - 1 - 39 44 85 85
Fax: +33 - 1 - 39 44 85 86
GERMANY
VSL Systems GmbH
BERLIN
Phone: +49 30 53 01 35 32
Fax: +49 30 53 01 35 34
GREAT BRITAIN
VSL Systems (UK) Ltd.
CAMBRIDGESHIRE
Phone: +44 (0) 1480 404 401
Fax: +44 (0) 1480 404 402
GREECE
VSL Systems A/E
ATHENS
Phone: +30 - 2 - 1 - 0363 84 53
Fax: +30 - 2 - 1 - 0360 95 43
NETHERLANDS
VSL Benelux B.V.
AT LEIDEN
Phone: +31 - 71 - 576 89 00
Fax: +31 - 71 - 572 08 86
Asia
BRUNEI
VSL Systems (B) Sdn. Bhd.
BRUNEI DARUSSALAM
Phone: +673 - 2 - 380 153
+673 - 2 - 380 827
Fax: +673 - 2 - 381 954
HONG KONG
VSL Hong Kong Ltd.
WANCHAI
Phone: +852 - 2590 22 88
Fax: +852 - 2590 02 90
Intrafor (Hong Kong branch)
WANCHAI
Phone: +852 - 2836 31 12
Fax: +852 - 2591 61 39
INDIA
VSL India PVT Ltd.
CHENNAI
Phone: +91 - 44 5214 56 78
Fax: +91 - 44 2433 99 02
INDONESIA
PT VSL Indonesia
JAKARTA
Phone: +62 - 21 - 570 07 86
Fax: +62 - 21 - 573 12 17
JAPAN
VSL Japan Corporation
TOKYO
Phone: +81 - 3 - 3346 - 8913
Fax: +81 - 3 - 3345 - 9153
KOREA
VSL Korea Co. Ltd.
SEOUL
Phone: +82 - 2 - 553 8200
Fax: +82 - 2 - 553 8255
MAINLAND CHINA
VSL Engineering Corp., Ltd.
HEFEI
Phone: +86 - 551 - 557 6008
Fax: +86 - 551 - 557 6018
NORWAY
VSL Norge A/S
STAVANGER
Phone : +47 - 51 52 50 20
Fax : +47 - 51 56 27 21
POLAND
VSL Polska Sp. z o.o.
WARSAW
Phone: +48 - 22 817 84 22
Fax: +48 - 22 817 83 59
PORTUGAL
VSL Sistemas Portugal Pre-
Esforço, Equipamento e
Montages S.A.
S. DOMINGO DE RANA
Phone: +351 - 21 - 445 83 10
Fax: +351 - 21 - 444 63 77
SPAIN
CTT Stronghold
BARCELONA
Phone: +34 - 93 - 289 23 30
Fax: +34 - 93 - 289 23 31
VSL-SPAM, S.A.
BARCELONA
Phone: +34 - 93 - 289 23 30
Fax: +34 - 93 - 289 23 31
SWEDEN
Internordisk Spännarmering AB
VÄSTERHANINGE
Phone: +46 - 8 - 5007 3820
Fax: +46 - 8 - 753 49 73
SWITZERLAND
VSL (Switzerland) Ltd.
SUBINGEN
Phone: +41 - 32 613 30 30
Fax: +41 - 32 613 30 15
VSL (Suisse) SA
VOUVRY
Phone: +41 24 48157 71
Fax: +41 24 48157 72
CREATING SOLUTIONS TOGETHER